Wltnesses



(No Model.)

G. P. E. PEARSALL.

PHOTOGRAPHIC DRY PLATE HOLDER.

INVENTUR 9M6. fwd

4 66.0% ATTORNEY Patented Nov. 6, 1883.

UNITED STATES PATENT OFFICE.

G. FRANK E. PEARSALL, OF BROOKLYN, NEW YORK.

PHOTOGRAPHIC DRY-PLATE HOLDER.

SPECIFICATION forming part of Letters Patent No. 287,857, dated November6, 1883,

Application filed May .34, 1883. (No model.)

To aZZ whom, it may concern:

Be it known that I, G. FRANK E. Pnansiirn, of Brooklyn, in the county ofKings and State of New York, have invented a new and useful Improvementin Photographic Dry-Plate Holders; and I do hereby declare that thefollowing specification, taken in connection with the drawings annexedto and forming part of the same, furnishes a full and clear descriptionI thereof sufficient to enable those skilled in the art to which itpertains to make and operate the same.

My invention-has for its object to furnish a holder for protecting avery sensitive platesuch as is used in a photographic camera during itstransmission from the chemical room to the place of use in the camera.Sensitive plates, which are used in photographic studios, are usuallywhat are known as wet and dry plates. These plates are usually held andexposed in a wooden frame; but for use in places other than thephotographic studi 0, and specially in out-of-door photography, it isextremely difficult to carry any number of wooden holders with sensitiveplates in them, therefore not more than two or three can be used at anytime without again going to the chemical room for more plates. To carrya large quantity of these plates, holders differ ent from the wooden ormetal plate-holders are necessary, to economize weight and space, and asany substance which will thoroughly exclude the light and protect thesensitive plate from injury is sufficient, paper has been found tofurnish an excellent envelope for such sensitive dry plates. A greatdifficulty to be overcome in the use of the paper envelopefor suchpurpose is the liability of rays of light to enter along the crevices orcorners of the envelope, and much labor has been spent in vain in theendeavor to adequately protect such plates from false rays of light.This ob ject I have accomplished by means of my invention, hereinafterdescribed, which combines in itself both an envelope, to preserve and tocarry the sensitive dry plates before use, and a plate-holder, to beused in the camera in place of the bulky frames heretofore used in theinstrument to hold the plates.

In the drawings, Figure 1 is a view in perspective of my improvedplate-holder closed,

and containing a plate ready for use. Fig. 2 represents the reverse sideof said plate-holder with the flap open, to show method of intro ductionof sensitive plate. Fig. 3 is a crossseetion upon the line 00 .r of Fig.2. Fig. 4is a viewin cross-section of the elastic strip used for closingthe aperture at which the slide enters. Figs. 5, 6, 7, and 8 show partswhich go to make up the envelope.

Similar letters of reference in the different figures indicatecorresponding parts.

To construct my improved envelope or plateholder, I take a piece of softpaper or other, suitable material which is impervious to the light anddampness and cut it,'as shown at A, Fig. 6, of substantially the sameshape as the sensitive plate. The dimensions of this paper back A are atrifle larger than the plate for which it is intended. Along the sidesof this back A, l glue narrow strips of wood, I), about an eighth of aninch thick and a quarter of an inch wide. At one end I also glue a stripof similar thickness, c,- but the latter strip, 0, is constructed with apiece of rubber, d, or similar elastic material let into a groove alongits center at an angle of about forty-five degrees, so as to raise therubber strip above the surface, as shown in Fig. 4-. A frame, 6, havingits sides a little wider than the strips 1), and constructed of paper orother suitable material, is glued upon the strips 1) 0, so that itsinner edges will project over the edges of the sensitive plate 13 andhold it in position. This frame is constructed in the shape shown inFig. 5, with two notches, ff, at the lower end, which notches allow theends of the rubber strip d to protrude without having the working of therubber strip interfered with by said frame-work. Along the two sides andacross the top of this frame-work c are glued other strips of card-boardor other suitable material, 9, Fig. 3, of substantially the same widthas the strips Z). Upon the strips 9 is glued the cover of soft paper 71,which completes the envelope. This cover is shown in the drawings byFig. 7. It has removedfrom its center H a portion large enough to allowthe desired exposure of the sensitive plate, and along the dotted linesi t each end of the same is bent to form a flap or tuck for folding overthe top and bottom of the previously-described framework, for thepurpose of completely closing the ends of the envelope after thesensitive plate and the slide have been inserted.

Fig. 8 shows a slide, which is made of stiff paper, and which isintended to be inserted at the top end 'of the envelope between thelayers It and e. The inwardly-projecting edges of the strips h and efurnish a groove or guide for the edges of the slide G. The lower end ofthis slide G is cut in a concave form, so that the pointsk is, enteringthe groove formed by the strips hand 6 across the bottom of theenvelope, feed the slide down into place without the edge of the slidecatching upon the edge of the strips. across at the part indicated bythe dotted lines, to form a small flap, L, which serves as a handpiecewith which to insert and withdraw the slide G, and which is folded downalong the dotted line and over the end of the envelope under the flap M.

After the parts A, b, e, g, and h are glued together, a cloth binding isput along the edges and across the hinges z i of the flaps M N.

A narrow band of metal, constructed as shown at P, is affixed to thelower end of the envelope by screws or pivots at z z. This band fitstightly over the hinge i, to close the flap N, holding it firmly downand affording a rigid end for the bottom of the envelope. Twoprojections, r r, prevent the strip P from being pushed back beyond theedge of the plateholder, but allow the strip to be brought forward, whendesired, to open the lower end, to withdraw the plate. Two bands S, ortheir equivalents, are glued across the back of the envelope A in such amanner that the ends of the flaps M N can be tucked under them and Iheld down in place. 0

The mode of using my improved plate-holder is as follows: The bandPbeing turned forward, and the flaps M N being opened, the slide G isinserted to cover the opening H.

The sensitive plate is then inserted at the bot tom of the envelope atthe opening afforded under the flap N and between A and c, Fig. 3. Theflap N being then turned over and its band The upper end of the slide Gis bent tucked under the strap S, the band I? is turned back into placeand the opening through which the sensitive plate is inserted is-heldtightly 5o closed and protected from any rays of light entering at thecorners and edges. The slide G being wider than the aperture H, and thenotches f allowing the elastic strip d to rise up to a width wider thanthe opening between 0 e, 5 5 insures a close contact at all times, whichprevents the entry of any false rays of light at the "upper edge of theenvelope at the place where What I do claim, and desire to secure byLetters Patent, is

1. The combination of the layers and strips A b e g with a slide, G, anda cover, 71, so that the sensitive plate can be introduced and securedat one end and the slide G at the other end, substantially as and forthe purposes described.

. 2. In combination with an envelope for a sensitive plate provided witha slide, G, substantially as described, the combination of a rubberstrip, d, arranged, substantially as described, to form a close contactwith the slide 1 G while being inserted or removed, and with the insideof cover h when the slide is out.

3. In an envelope or holder for sensitive 8 5 dry plates, theconstruction and combination of the side strips, 6 0, provided with therecesses or notches f f, acting in conjunction with the elastic rubberstrip (Z and slide G, substantially as and for the purposes described.

G. FRANK E. PEARSALL.

, lVitnessesz- J OHN O. BOSTELMANN, J AMES 0. HILL.

